2A, 2B AND 2C TUNERS (ATU)

Copyright 2013 CCA


Original 2C Tuner in Collins 150C Transmitter

 
2C Shown rebuilt for 30FXB

The 2 Series tuners were used with Collins Early Model Transmitters
(See Manual Drawing below for the Figures)
2B comes with 2 RF ammeters – Figure 2 (2b & 2C rated 250 Watts or less)
2C comes with 1 RF ammeter
Figure 1 of Manual Drawing shows 2A & 2C (2A 50 Watts or less)
2A Panel Height is 3.5 in. & 2B & 2C Panel Height is 7 in.
Input tuning knob is always on left – from front.

Manual for 2 Series ATU

Manual Drawing for 2 Series ATU

XMTR Model Introduced w/ Tuner
4A Extra (2A)
30W Jan ’32 n/a
150 (Bul 100) Jun ’32 2B/2C
40B Oct ’32 Custom  (1 Knob & 1 RF Ammeter)
150B Feb ’33 2B/2C
32A & B Apr ’33 None Stock  or 2A
300B Aug ’33 2B/2C
30DXB Jan/Feb ’34 2B/2C
30FXB Jun ’34 2B/2C
300B Oct ’34 2B/2C
30FX Jun ’34 2B/2C
32F (Jan ’35) 2A
300BA May ’35 2B
150C Jun ’35 2B/2C
202-A Sep ’35 n/a  Enclosed
45A Oct ’35 n/a  Extra  (2B/2C)
600A Dec ’35 Custom w/ 2 RF Ammeters
30FXC Feb ’36 Later Version 2B w/ 2 RF Amp
30FXR Jul ’36 Later Version 2B w/2 RF Amp
20C Aug ’36 n/a  BC  Enclosed
32G Mar ’37 n/a  None std  (2A/2B – f/ 1/2 Ammeters)
201/202BA Jun ’37 Commercial
250A Aug ’37 Commercial
New 20C Sep ’37 n/a  BC  Enclosed – Later 20C Design
18J Mob Oct ’37 n/a
30J Nov ’37 n/a
– – – – – – – – CCA – – – – – – –
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